Modern Mining December 2015

PRODUCT News

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MODERN MINING

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December 2015

Index to advertisers

Brelko Conveyor Products

Condra Cranes

DRA Global

20-21

FLSmidth

IFC

Joy Global Africa

Maelgwyn Mineral Services Africa

MDM Engineering

Mining Indaba

IBC

New Concept Mining

OBC

Osborn Engineered Products

Sandvik Mining Systems

OFC

Simantel/Caterpillar

Stefanutti Stocks Mining Services

Tenova TAKRAF

Torre Lifting Solutions

Verder Pumps

Wampex

WorleyParsons

Maximised throughput and uptime, with

minimised costs, are the goals of all pro-

cessing plants. Extensive research and

smart engineering have resulted in the

development of a hydrocyclone that can

reportedly achieve up to 50 % higher

throughput capacity in comparison with

competitor cyclones in the 26-inch diam-

eter range.

The Cavex® 700CVX hydrocyclone,

with a smaller, more space efficient body,

has a higher throughput than the Cavex®

650CVX hydrocyclone making it attractive

for new installations as well as retrofitting

New hydrocyclone offers high throughput

into existing cyclone

clusters. This allows mine

sites to increase capac-

ity with minimal capital

expenditure while main-

taining a competitive

advantage.

Sheldon Gabriel, Pro

duct Manager Cyclones

of Weir Minerals Africa

and Middle East, explains

that the inclusion of

a unique laminar spi-

ral inlet in the Cavex®

700CVX hydrocyclone

is the secret behind the

success of this new prod-

uct. “As with all products we introduce to

the market, the design is based on feed-

back from the market and intensive field

testing. The result is a hydrocyclone that

produces the desired results due to its

large inlet and vortex finder configuration.

“It is important to note that the

development of the Cavex 700CVX hydro-

cyclone was not based merely on a cone

modification, but rather on an entirely new

feed geometry that substantially increases

hydraulic throughput capacity while mini-

mising localised wear on the feed chamber

and vortex finder,” says Gabriel.

Weir Minerals offers a range of equipment solutions including hydrocylones,

rubber lining, hoses and slurry valves.

Conventional hydrocyclone geometry

causes migration of unclassified solids

into the overflow, which can result in valu-

able mineral losses. The laminar spiral inlet

geometry design of the Cavex® 700CVX

hydrocyclone provides a natural flow path

into the hydrocyclone. Due to the fact that

the shape has no sharp edges or corners,

it readily allows the feed stream to blend

smoothly and efficiently with the rotating

slurry within the chamber.

“When turbulence is reduced, sorting

efficiency is naturally enhanced and fewer

misplaced fines bypass to the underflow,

with less coarse tramp material bypassing

to the overflow.This is achieved bymaximis-

ing the air core diameter created within the

rotating mass of fluid in the hydrocyclone

and results in reductions in overgrinding

and circulating loads,”says Gabriel.

Gabriel points out that in conventional

hydrocyclones, slurry bursts into the cyl-

inder with no flow control. The resultant

turbulence is responsible for premature

and localised wear of the liner walls caus-

ing inefficient classification and decreased

wear life. By minimising flow resistance

through the feed chamber, Cavex® hydro-

cyclones are able to process substantially

higher slurry volumes.

Rene Calitz, Weir Minerals Africa, tel (+27 11) 929-2622

Contract awarded for chrome recovery plant

JB Switchgear Solutions was recently

awarded a multi-million rand contract

for the design, manufacture and supply

of motor control centres (MCCs) and VSD

panels for Anglo American Platinum’s

Amandelbult chrome recovery plant (CRP).

The CRP will be installed prior to the sec-

ondary circuit, mainstream inert grinding

(MIG) process and scavenger flotation. The

newCRPwill be of amodular design consist-

ing of twin modules of spiral concentrators,

employing a multi-stage configuration of

separators and spirals. Once the chromite

has been extracted, the concentrate will

be redirected to the platinum beneficiation

plant for further processing.

The project is located within Rustenburg

Platinum Mines’ mining right area, 25 km

south of Thabazimbi in Limpopo Province.

The chrome recovery plant will com-

prise two modules, with a combined

capacity of 250 kilotons per month.

Each will be approximately 30 m x 30 m

in size and comprise feed systems,

thickeners, cyclones and spirals.

JB Switchgear is supplying six ‘Eagle’

series MCCs. Starter sizes vary between

1,1 kWand 45 kW. The operational voltage is

550 V with a prospective fault level of 50 kA.

In addition to the MCCs, the company is

also supplying 52 VSD panels ranging from

0,25 kW to 220 kW. The communication pro-

tocol for this project is ‘Profibus’.

JB Switchgear is a level 4 BEE supplier,

ISO 9001 certified with comprehensive

IEC 61439-2 type test certification on its

‘Eagle’ series, including internal arc.

JB Switchgear, tel (+27 11) 027-5804